net.sf.saxon.expr

## Interface MappingFunction<F extends Item,T extends Item>

- All Known Implementing Classes:
    Atomizer.AtomizingFunction, ForExpression.MappingAction, ForSequenceMappingAction, KeyMappingFunction, StandardCollectionURIResolver.FileExpander

      public interface MappingFunction<F extends Item,T extends Item>

  MappingFunction is an interface that must be satisfied by an object passed to a MappingIterator. It represents an object which, given an Item, can return a SequenceIterator that delivers a sequence of zero or more Items. This is a generic interface, where F represents the type of the input to the mapping function, and T represents the type of the result

- - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `SequenceIterator<? extends T>` | `map(F item)` Map one item to a sequence.

- - ### Method Detail

    - #### map

          SequenceIterator<? extends T> map(F item)
                                                         throws XPathException

      Map one item to a sequence.
      Parameters:
        `item` - The item to be mapped.
      Returns:
        one of the following: (a) a SequenceIterator over the sequence of items that the supplied input item maps to, or (b) null if it maps to an empty sequence.
      Throws:
        `XPathException` - if a dynamic error occurs

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